can any say a site which enhance linking verb exercises

[jahangir]

hi ,can any say a site which enhance linking verb exercises.
is
are
was
being
will be
would be
shall be
could be
should be
shall have been
will have been
would have been
could have been

[Tdol]

Those examples are all the same verb and you can practise the tenses and forms of the verb here: http://www.usingenglish.com/quizzes/